cm needle is placed 12 cm away from a
convex mirror of focal length 15 cm. Give thelocation of
the image and magnification.
Describe what happens as the needle is movedfarther from
the mirror.
Answer:
Using 
and sign conventions ,we
get,
or
The image is
formed at 
cm behind the mirror.
As
magnification 
we get,
the image is
virtual, erect and diminished.As we move the needle away from themirror, the
image goes on decreasing in sizeand moves towards the principal focus onthe other
side.
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